Ключевые слова: angles, blue sky, building industry, checking, construction equipment, construction site, device, engineer, engineering, exact position, examination, geodesy, horizontal, inspection, instrument, land, level, leveler, levelling, looking, measurement, measuring, outdoors, points, site, survey, surveying, surveyor, tacheometer, theodolite, tool, topographic, transit, tripod, unit, work, worker, workplace,